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Finding the Fourth Proportional to 226.45, 312.51 and 128.21

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Solution

The fourth proportional to 226.45, 312.51 and 128.21 is: 176.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    226.45 : 312.51 = 128.21 : x
  2. Step 2: Convert to fraction form
    226.45/312.51 = 128.21/x
  3. Step 3: Cross multiply
    226.45x = 312.51 × 128.21
  4. Step 4: Simplify right side
    226.45x = 40,064.86
  5. Step 5: Solve for x
    x = 40,064.86/226.45
  6. Step 6: Final answer
    x = 176.93

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.